SU1609832A1 - Method of modifying viscose fibre - Google Patents

Abstract

The invention relates to the field of chemical fiber technology, in particular to the production of raw materials for the production of carbon fiber materials. The invention makes it possible to increase the yield of coke residue in the production of carbon fiber material by introducing 6-25 wt.% Of the α-cellulose of the quaternary salt of 2-methyl-5-vinylpyridine in the presence of 0.02- 0.04% by weight of viscose chromium salt - YI. Fiber is obtained from this solution and sent to carbolization.

Description

The invention relates to chemical fiber technology, in particular to the production of raw materials for the production of carbon fiber materials.

The purpose of the invention is to increase the yield of coke residue in the production of carbon fiber materials.

Examples of viscose with an alpha-cellulose content of 7 parts by weight, carbon disulfide Jbyb by weight of alpha-cellulose, caustic of 6.4% by weight are given a quaternary 2-methyl-5-vinylpyridine salt -cellulose and potassium dichromate — and, and max. The viscose is molded into a sedimentation bath containing 120 g / l of sulfuric acid, 15 g / l of zinc sulfate and 270 g / l of sodium sulfate, at 35–40 ° C. The amount of grafted polymer in the resulting fiber, and, g May. . The coefficient of variation for the degree of vaccination is 0.56%. After carbonization of viscose fiber in argon with a temperature rise of 3 C / min to oio C, the coke residue is 21%. Example 2. Viscose with an alpha-cellulose content of 8% by weight, carbon disulfide is 35%

from the mass of alpha-cellulose, caustic soda ol May. /, a quaternary salt of 2-methyl-5-vinylpyridine is introduced in an amount of 25% by weight of alpha-cellulose and potassium dichromate - U.U4 wt.%. The viscose is molded into a precipitation bath containing 100 g / l of sulfuric acid sodium sulfate, at v30 and L. The amount of grafted polymer in the resulting fiber is 16.0–17.0 may% Coefficient of variation in the degree of grafting and, chu /, After carbonization in Example 1, the coke residue is 26%.

Example 3. In viscose with an alpha cellulose content of 6.5 wt.% Carbon disulphide — 35 wt.% Based on the mass of alpha cellulose, caustic soda — 6.4 mas. % The quaternary methyl-5-vinylpyridine salt is introduced in the amount of 15% by weight of alpha-cellulose and sodium bichromate - 0.03 wt.%. The viscose is molded into a precipitation bath containing 140 g / l of sulfuric acid, 15 g / l of zinc sulphate and 270 g / l of sodium sulphate. The amount grafted in the resulting fiber 9 7-10 wt.%. The coefficient of variation for the degree of grafting 0.52%. After carbonization

h

Example 1 coke residue composition 1 em 24%.

Example 4 (comparative). Viscose fiber containing residual xantogenate groups with a degree of esterification of 10 is incubated for 2 minutes in a graft solution containing: a quaternary 2-methyl-5-vinylpyridine salt in an amount of 0.6 wt.% And potassium bichromate 0, 0052 wt.%. The amount of graft polymer in the resulting fiber is 4.0-5.0%. The coefficient of variation for the degree of vaccination is 8.5%. After carbonization in Example 1, the coke residue is 16%.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A method for modifying viscose fiber by introducing a quaternary salt of 2-methyl-5-vinylpyridine into it using the redox system, cellulose xanthate is a chromium-VI salt, due to the fact that, in order to increase the yield of coke residue during the subsequent production of carbon fibers, the quaternary salt of 2-methyl-5-vinylpyridine in the amount of 6-25% by weight of alpha-cellulose is injected into the solution for forming fiber in the presence of 0.02-0.04% by weight of viscose salt chromium vi.